thanks for the links but they don't seem to refer to the info i got via personal message, rather than post. the material i got was simplified, the current
links seem to me to be jargon rich. i hate jargon.... if i don't know it! :-)
i have been up the bloody mast
most of the day so drenching my woes in heinken. so will set aside the info till tomorrow and see if it makes more sense to me then. MARPA? ARPA? etc etc....
cheers and thanks for reply